How many IP address ranges are specified in RFC 1918?
A. 1 in Class A, 2 in Class B, and 4 in Class C
B. 2 in Class A, 4 in Class B, and 8 in Class C
C. 4 in Class A, 8 in Class B, and 16 in Class C
D. 1 in Class A, 16 in Class B, and 256 in Class C